Why does my Acura die when driving?

If all the electrical cuts off at this point, I would suspect the main relay is failing and needs replaced.

It sounds like the same problem I had, the ignition switch is defective. The part is a plastic component only around 30 bucks but its tricky to remove. There are sheer bolts which must be taken out. Acura sells them, a dealer part. I improvised with standard bolts when I changed mine. It took me about two to three hours to change out mine. Car started and did not stall afterwards. The Acura dealer changed mine once under warranty when I did not have any problem with it and the dealers igniction switch is the one that went bad about two years after replacing it. I replaced the dealer part and its been good so far(knock on wood) for about four years. It only coast me for the part. You may have a warranty on the igition switch so if you do might as well let them change it out the first time for free under the warranty.